Denim, canvas and heavy cotton won't be a problem. You'll need to select the proper needle and maybe adjust the thread tension, but that will be covered if you take a class.
I can't remember if you own a sewing machine, but if you are buying a new one, you might look at ratings on Consumer Reports.
My Viking would happily sew multiple layers of Cordura without a problem, and I made lots of things from the heaviest canvas I could find.



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